docs: def __computeTopLayer(self):
          """
          deprecated: now this is calculated when entities get extracted
          """
  
          exit = []
          for c in self.all_classes:
              if not c.parents():
                  exit += [c]
          self.toplayer_classes = exit  # sorted(exit, key=lambda x: x.id) # doesnt work
  
          # properties
          exit = []
          for c in self.all_properties:
              if not c.parents():
                  exit += [c]
          self.toplayer_properties = exit  # sorted(exit, key=lambda x: x.id) # doesnt work
  
          # skos
          exit = []
          for c in self.all_skos_concepts:
              if not c.parents():
                  exit += [c]
          self.toplayer_skos = exit